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authsrv: handle short reads in initkeyseed()

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This commit is contained in:
cinap_lenrek 2017-02-26 23:10:17 +01:00
parent 6de804b578
commit 394af5a216
1 changed files with 12 additions and 6 deletions
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18
sys/src/cmd/auth/authsrv.c
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@ -1008,14 +1008,20 @@ initkeyseed(void)
int fd;
genrandom(keyseed, sizeof(keyseed));
if((fd = create("/adm/keyseed", OWRITE|OEXCL, 0600)) >= 0){
write(fd, keyseed, sizeof(keyseed));
} else if((fd = open("/adm/keyseed", OREAD)) >= 0){
read(fd, keyseed, sizeof(keyseed));
} else{
syslog(0, AUTHLOG, "initkeyseed: no seed file: %r");
if((fd = open("/adm/keyseed", OREAD)) >= 0){
werrstr("file truncated");
if(read(fd, keyseed, sizeof(keyseed)) == sizeof(keyseed)){
close(fd);
return;
}
close(fd);
}
syslog(0, AUTHLOG, "initkeyseed: no keyseed: %r");
if((fd = create("/adm/keyseed", OWRITE, 0600)) < 0){
syslog(0, AUTHLOG, "initkeyseed: can't create: %r");
return;
}
write(fd, keyseed, sizeof(keyseed));
close(fd);
}